What must be in Application or Service to Facilitate Testing

1. Time acceleration and deceleration to test time based calculations
2. Assert like feature
3. Appropriate logging and able to switch logging levels at run or deployment time
4. Facility to run application in Test Mode similar to Training mode
5. Facility to create and manage test scenarios in production environment similar to test users
6. Facility to measure time of execution for various tasks
7. Separation of messages (error, warning or info) and configuration parameters.